Abstract : The physicomechanical properties of glass-fiber reinforced plastics include glass-fiber stren th and orientation in the bin er; mechanical and physicochemical properties of the thin binder coats which develop fibers and insure simultaneous deformation; adhesion of binder to fiber;ABILITY OF FIBER TO BE WET BY BINDER; AND HOMOGENEOUS DISTRIBUTION OF BINDER BETWEEN FIBERS. The two main problems facing Soviet scientists are the efficient utilization of the properties of the componen s and the development of reinforced systems in which fiber and binder have optimum mutual affinity. (Author)